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NCERT Class XII Chemistry
Chapter - Alcohols, Phenols and Ethers
Questions with Solutions

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Question : 21 of 45
Marks: +1, -0
Name the reagents used in the following reactions :
(i) Oxidation of primary alcohol to carboxylic acid.
(ii) Oxidation of primary alcohol to aldehyde.
(iii) Bromination of phenol to 2,4,6-tribromophenol.
(iv) Benzyl alcohol to benzoic acid.
(v) Dehydration of propan-2-ol to propene.
(vi) Butan-2-one to butan-2-ol.
Solution:  
(i) Alkaline KMnO4\mathrm{KMnO}_4
(ii) Pyridinium chlorochromate in chloromethane (CH2Cl2)\mathrm{(CH_2Cl_2)}
(iii) Br2/H2O\mathrm{Br}_2/\mathrm{H}_2\mathrm{O}
(iv) Alkaline KMnO4\mathrm{KMnO}_4
(v) Conc. H2SO4\mathrm{H}_2\mathrm{SO}_4 or H3PO4\mathrm{H}_3\mathrm{PO}_4 at 433-443 K
(vi) H2/Ni\mathrm{H}_2/\mathrm{Ni} or NaBH4\mathrm{NaBH}_4 or LiAlH4\mathrm{LiAlH}_4
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